Edit: it will be a reward from patch 7.1.5 Brawler's guild! It will likely be tied to max rank as the mushan that it replaced.

Edit2: Sea Serpent mount confirmed for patch 7.2....that or it's an old god mount and the abyss bit stands for something else...still very cool (Abyss Worm, model not up yet in the site as of the time of writing this post).

Comentado por Bananameister

So far in this expansion we can ride anythingWe should start riding snakes